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Comment on “Glacial cycles drive variations in the production of oceanic crust”

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Science  04 Sep 2015:
Vol. 349, Issue 6252, pp. 1065
DOI: 10.1126/science.aab2350

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Crowley et al. (Reports, 13 March 2015, p. 1237) propose that abyssal hill topography can be generated by variations in volcanism at mid-ocean ridges modulated by Milankovitch cycle–driven changes in sea level. Published values for abyssal hill characteristic widths versus spreading rate do not generally support this hypothesis. I argue that abyssal hills are primarily fault-generated rather than volcanically generated features.

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